自然科学版
陕西师范大学学报(自然科学版)
合成气定向催化转化科学与技术专题
射频等离子体诱导合成MoO2-Mo2N复合催化剂及其在合成气制低碳醇中的应用
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王亚文1, 侯亮1, 屈皓1, 李建立1, 苏海全1* , 谷晓俊2
(1 内蒙古大学 化学化工学院, 内蒙古自治区稀土材料化学与物理重点实验室,内蒙古 呼和浩特 010021;2 内蒙古大学 化学化工学院, 内蒙古自治区煤炭化学重点实验室,内蒙古 呼和浩特 010021)
苏海全,男,教授,博士生导师,主要从事合成气定向催化转化方面的研究。E-mail: haiquansu@yahoo.com
摘要:
通过射频等离子体改性体相Mo2N制备了MoO2-Mo2N复合催化剂,并考察了其在合成气制低碳醇反应中的催化性能。利用XRD、TEM、XPS、CO-TPD对改性前后的催化剂进行了表征,结果发现在等离子体处理过程中,体相Mo2N可与表面氧原子发生结构重组,产生了更多的活性位点,且生成的MoO2与Mo2N间存在一定的相互作用。所制得的MoO2-Mo2N复合催化剂的催化性能较体相Mo2N有所提升,在350 ℃反应温度下,CO转化率达到32.7%,醇选择性达到34.03%,醇类时空产率达到79.5 mg/(g·h) 。
关键词:
射频等离子体;氮化钼;氧化钼;合成气;低碳醇
收稿日期:
2018-10-23
中图分类号:
O643.36
文献标识码:
A
文章编号:
1672-4291(2019)01-0060-08
基金项目:
国家自然科学基金(21476118);内蒙古自治区“草原英才”创新团队基金(201201);内蒙古自治区应用技术研究与开发资金(201702023, 515330303)
Doi:
Radio frequency plasma induced synthesis of MoO2-Mo2N catalyst and its application in synthesis of higher alcohols from syngas
WANG Yawen1, HOU Liang1, QU Hao1, LI Jianli1, SU Haiquan1*, GU Xiaojun2
(1 Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, Inner Mongolia, China;2 Inner Mongolia Key Laboratory of Coal Chemistry, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, Inner Mongolia, China)
Abstract:
MoO2-Mo2N composite catalyst was prepared by modifying bulk phase Mo2N via RF plasma technique, and its catalytic performance in higher alcohols synthesis from syngas was investigated. The catalysts were characterized by XRD, TEM, XPS and CO-TPD. It was found that during the plasma treatment, the bulk phase Mo2N can recombine with the surface oxygen atoms, which resulted in more active sites on the catalyst. Also there is certain interaction between MoO2 and Mo2N. The catalytic performance of the prepared MoO2-Mo2N composite catalyst is improved compared with that of the bulk phase Mo2N. At the reaction temperature of 350 ℃, the CO conversion rate, the alcohol selectivity, and the alcohol space-time yield reach 32.7%, 34.03%, and 79.5 mg/(g·h) respectively.
KeyWords:
radio frequency plasma; molybdenum nitride; molybdenum oxide; syngas; higher alcohols